1. Explore the type of symmetry that each organism has. The pig has bilateral symmetry and so does the crayfish. This means that the right have is a mirror image of the left half and the left is a mirror image of the left half. The starfish is also bilateral symmetry. 2. Label a picture of the organism with these terms: anterior, posterior, dorsal, ventral, lateral, head, thorax, abdomen.
PIg
Crayfish
Starfish 3. What is the advantage of various structures found on the body such as appendages, mouth parts, sensory antennae, skin receptors, etc. Discuss all the different types of receptors. The crayfish appendages are claws that help them catch food. In the mouth, the maxillipeds tear the food and the mandibel grinds the food. The antennae that are in front of the mouth and these help in swimming and feeding in larvae forms. There is a statocyst at the base of each antennae that helps with balance, along with sensory hairs. There is also sand at the base of these that send impulses to the brain as the crayfish moves. The crayfish has a hard exoskeleton that does not have skin receptors. The pig has legs with elbows and knees like a human that lets it move very easily. In the mouth, they have taste buds and an epiglottis that folds over the glottis at the root of the tongue to prevent food and liquid from entering the trachea while swallowing. The soft palate separates the nasal and oral while swallowing. The hair on the pig will help it feel things that are close to it as well as help to keep the pig warm.
The pig has bilateral symmetry and so does the crayfish. This means that the right have is a mirror image of the left half and the left is a mirror image of the left half. The starfish is also bilateral symmetry.
2. Label a picture of the organism with these terms: anterior, posterior, dorsal, ventral, lateral, head, thorax, abdomen.
PIg
Crayfish
Starfish
3. What is the advantage of various structures found on the body such as appendages, mouth parts, sensory antennae, skin receptors, etc. Discuss all the different types of receptors.
The crayfish appendages are claws that help them catch food. In the mouth, the maxillipeds tear the food and the mandibel grinds the food. The antennae that are in front of the mouth and these help in swimming and feeding in larvae forms. There is a statocyst at the base of each antennae that helps with balance, along with sensory hairs. There is also sand at the base of these that send impulses to the brain as the crayfish moves. The crayfish has a hard exoskeleton that does not have skin receptors.
The pig has legs with elbows and knees like a human that lets it move very easily. In the mouth, they have taste buds and an epiglottis that folds over the glottis at the root of the tongue to prevent food and liquid from entering the trachea while swallowing. The soft palate separates the nasal and oral while swallowing. The hair on the pig will help it feel things that are close to it as well as help to keep the pig warm.